Are you struggling to integrate barcode readers or serial printers into your CompactLogix automation?
The Allen-Bradley 1769-ASCII module provides a direct, reliable link between your control system and devices using American Standard Code for Information Interchange (ASCII) protocol. This specialty module eliminates complex gateways, simplifying data exchange in factory automation.
Product Overview
The 1769-ASCII, part number 1769-ASCII, is a specialty module from Rockwell Automation / Allen-Bradley within the CompactLogix product line. It functions as a communication interface module, connecting ASCII-compatible devices like barcode readers to 1769 CompactLogix or MicroLogix 1500 controllers. This module features two individually isolated ports, each configurable for independent ASCII data exchange.
Technical Specifications Breakdown
Key parameters for the 1769-ASCII are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Part Number | 1769-ASCII |
| Product Type | Specialty module |
| Power Rating | 425mA @ 5Vdc |
| Power Dissipation, Max | 2.13 Watts |
| Thermal Dissipation | 7.3 BTU/hr |
| Temperature Range | 0-62 deg. C (32 to 140 deg. F) |
| Isolation Voltage | 30 Volts Continuous |
| Number of Inputs | 2 full duplex (RS-232, RS-422) 2 half duplex (RS-485) |
| Handshaking | RTS/CTS Hardware Handshaking Enabled |
Industry Applications
Barcode Reading in Logistics
In warehouse automation, barcode readers using ASCII protocol can be directly connected to the 1769-ASCII. The two ports allow simultaneous reading from different conveyor lines, reducing controller overhead.
Serial Printer Integration for Labeling
Manufacturing lines often require serial label printers. This module enables direct ASCII communication, eliminating the need for protocol converters.
Weigh Scale Data Acquisition
Many industrial scales output ASCII strings. The 1769-ASCII captures this data reliably, with hardware handshaking (RTS/CTS) to prevent data loss.
Installation & Setup Guidance
Mount the 1769-ASCII using chassis mount, DIN rail, or panel mounting as per standard CompactLogix practice. The module has a power supply distance rating of 4, meaning it must be placed no more than four modules away from the 1769 CompactLogix power supply. It is backplane powered, so no external supply is needed. For MicroLogix 1500 systems, install it beside the base unit. Use Belden 8761 shielded cable for serial connections to minimize noise.
Maintenance & Reliability
Given its 0-62 deg. C operating temperature range, ensure adequate ventilation in enclosures. The module uses RTS/CTS hardware handshaking for reliable data transfer. Periodic inspection of serial cable connections and environmental conditions is recommended to maintain uptime.
Compatibility & Integration
The 1769-ASCII is compatible with 1769 CompactLogix controllers and MicroLogix 1500 controllers. It supports RS-232, RS-422 (full duplex), and RS-485 (half duplex) communication. Each port can be configured independently, allowing mixed device types on a single module.
Selection Guide & Purchasing Advice
When selecting the 1769-ASCII, verify your controller compatibility and power supply distance rating. SpareTechPLC stocks this module with fast shipping. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
Common issues include incorrect cable wiring or baud rate mismatch. The module provides serial port status indicators for TX FIFO overflow, RX FIFO overflow, RX parity error, handshake error, and new data flag. Check these flags during commissioning. Ensure the serial input voltage signal is within 3…25V dc for logic 0 and -3…-25V dc for logic 1.
